Comment 4 for bug 152638

I confirm that the upstream patch fixes this:
$ mkdir test; cd test; touch test
$ sudo chown root:video test
$ sudo chmod 660 test
$ ls -l
-rw-rw---- 1 root video 0 2007-10-20 17:55 test
$ gedit test
$ ls -l
-rw-rw---- 1 root video 3 2007-10-20 17:55 test
-rw-r----- 1 daniel daniel 0 2007-10-20 17:55 test~